One of the most heart-stopping events of the storm, the emergency evacuation of a major downtown hospital in manhattan, including newborns from a critical care unit. David muir has more on the heroes who got everyone out safe and sound. So many stories from that night. Reporter: They really were heroes, amy. Great to see you this morning. As you know, it was quite a sight to watch nurses walk out of the front entrance here. You see the neighborhood still completely in the dark. Not a light on as people get ready for work this morning. What is emerging, is a clearer portrait of the work inside this hospital. And this morning, we meet the moms grateful, for the nurses and doctors who brought those babies down. The stories behind some of the unning images, after nyu medicacenter went dark are emerging.The nurse holding the newborn. The respirators shut down. The nurse doing the work by hand, instead. Nurses and paramedics carried the babies down from the ninth floor, the neonatal intensive care unit. 20 blankets in all down a dark and chaotic stai he doesn't want to talk about it all over again. Reporter: Margaret and greg and their baby, cole, made their way down the stairwell, too. You could hear the winds howling. It was really strong. Reporter: Baby cole was just 6 hours old when the hurricane first began lashing the hospital. When evacuations began, they were brought into that stairway, too. Only flashlights guiding the way. A nurse carrying their tiny baby. Sharing the steps with the other patients being carried down on plastic sleds, rushed in by firefighters and paramedics. You see them carrying the women that couldn't walk down the stairs. Reporter: So this precious baby, arianna, who was born premature with a heart condition. Her mother had been sent home while doctors kept watch over the baby for a few more weeks. Then, the storm hit. And the mother raced in from long island, after hearing the hospital had been evacuated, not knowing where she would find her baby. When she got into the city, she was told her little girl was taken to mt. Sinai hospital. And there, she found her. Another newborn saved by the heroic nurses. My daughter couldn't have been here right now. Reporter: Those parents so thankful. I spent some of the overnight with them at that hospital they've been moved to. Both babies fine, arianna and cole. Little cole, I'm told, a little cold, in fact, as he was moving to the next hospital because it was raining. But the doctors say he's going to be just fine. It will be quite a thanksgiving for those families. David, thanks so much. What a story they're going to have. They'll tell him later. Time, now, for another check of the weather and sam champion.

This transcript has been automatically generated and may not be 100% accurate.

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